I have been trying to figure out what cleaning crew I want to buy for my fowlr. I have seen that some sites recomend these as part of there cleaning crew. are they any good? and will they be ok and long lived just feeding off algae in my tank?
They don't "eat" hair algae, they just suck the juices from it and then it regains them back. They last about a week, have a very short lifespan, and get stuck in intakes. Sea hares are better IMO, but they like to eat graciliaria. Hermits and Snails are your best bet.